Grainsby is a hamlet in the Easy Lindsey district of the county, 7 miles S of the centre of Grimsby and 8 miles N of Louth. The hamlet consists of little more that the church and a few hosues and a farm on a minor road. Grainsby Hall was here until it was demolished in 1972, and the landscape still has the appearance of parkland. The church is of squared and coursed chalk, limestone rubble, and red brick, and consists of a W tower, nave with S porch and chancel. The tower is 13thc, of chalk with battlements and gargoyles, the nave has a 12thc S doorway. The S side of the church is much repaired and the N side is of brick, replaced in 1834 as part of a general restoration, but still in English bond. The chancel walls show signs of fire damage and contain fragments of 12thc. sculpture. Other Romanesque features are the S nave doorway and a plain font.

In 1066 Spillir, Aethelstan and Leofsige had 3 carucates of land here. In 1066 This land was held by Wimund from Alan, Count of Britanny. The inhabitants numbered 29 households and there were 51 acres of meadow and turbary for peat cutting. Wimund was succeeded by his son Eudes de Grainsby, and the manor seems to have remained in that family until the 14thc.

The simple chevron decoration, plain font and tall doorway with plain scallop capitals all suggest a date in the 1st half of the 12thc.